BOTANY. 157 



together for the veins which spring from them to unite 

 themselves at least at their base, the leaf is called simple (PI. 

 42, Fig. 2); whenever, on the contrary, this junction cannot 

 be effected, and the veins surrounded by the parenchyma are 

 separated by clefts, the leaf is said to be divided ; where 

 several secondary parts are attached to a common petiole, 

 each remaining distinct and free, the leaf will be compound 

 (PI. 41, Fig. 4), and the parts will bear the name of folioles. 

 The leaves are sessile when they attach themselves by their 

 base to the stem or branches ; they are petiolate when they 

 attach themselves to a support called petiole or foot stalk ; the 

 angle which the leaf makes with the stem is called the axil', 

 the wide portion of the leaf is termed the limb ; it has two 

 faces, the superior and inferior*. 



EXPLANATION OF THE FIGURES ON PLATES 42, 43. 



Fig. 1, 2 : Parallel veined leaves. 



Fig. 2, 3 : Penniverved or feather-veined leaves. 



Fig. 4 : Same, compound. 



Fig. 5, 6 : Palminerved or radiated leaves. 



Fig. 7 : Same, compound. 



Fig. 8, 9 : Pedatinerved leaves. 



Fig. 10 : Same, compound. 



Fig. 11, 12 : Peltinerved or peltate leaves. 



Fig. 13 : Same, compound. 



EXPLANATION OF THE FIGURES ON PLATE 45. 



Fig. A: 1, monopetalous corolla; 2, monosepalous calyx. 



Fig. B : Irregular polypetalous corolla. 



Fig. C : Regular polypetalous corolla. 



Fig. D : Mode in which the pollen is disposed in an anther. 



Fig. E : Granules of the pollen floating in the fovilla. 



Fig. F : Dehiscence of an anther. 



Fig. G: 1, filament; 2, anther. 



Fig. H: 1, stigma; 2, style; 3, germen. 



Fig, K : Hypogenous stamens. 



Fig. L : Perigenous stamens. 





